共查询到18条相似文献,搜索用时 960 毫秒
1.
原位TiC颗粒增强铁基复合材料的磨粒磨损性能研究 总被引:1,自引:1,他引:0
采用在普通碳钢的熔炼过程中加入钛的方法制备了不同成分的原位自生TiCP/Fe复合材料,在观察显微组织和测定性能的基础上进行了磨粒磨损特性研究.结果表明,简单的熔铸法可以制备不同体积分数的TiCP/Fe复合材料,材料中TiC以细小的规则多边形状存在.高硬度TiC的形成使得复合材料抗磨粒磨损特性得到提高,其性能总体上随TiC颗粒体积分数的增加而提高,在5~35N载荷范围内,载荷越大,TiC含量越高,表现出越优异的耐磨性能.当制备复合材料时添加过量的Ti使基体中Fe3C消失时,材料宏观硬度降低,但复合材料耐磨性仍得到提高.复合材料的磨损机制以犁削和磨沟为主,形成一次磨屑. 相似文献
2.
采用在普通45#钢的熔炼过程中加入Ti的方法,制备了不同成分的原位TiC/Fe复合材料,并观察分析不同成分TiC/Fe复合材料的显微组织及硬度变化.结果表明:简单的熔铸法可以制备不同体积分数的TiCp/Fe复合材料,复合材料中多数TiC以细小的规则三角形或四边形存在,且随Ti加入量的增加而增多,TiC达到一定含量时,还会形成棱面枝晶状TiC;材料硬度则随TiC含量增加而提高.当材料制备时只添加Ti,则TiC的形成使基体中碳含量减少,从而使基体中的Fe3C减少或消失,其硬度随钛含量的增加而先增后降,同时过量的钛不仅形成缺碳的非计量比TiCx,还形成条状的Fe2Ti金属间化合物. 相似文献
3.
4.
随着海洋活动增加,军舰、商船、海上钻井平台等海洋构筑物表面滑摔现象频发,已经严重影响人员安全和海洋事业的发展。为了解决这个问题,世界各国纷纷利用表面处理技术制备各类涂层,提高海洋构筑物表面的防滑性能。本试验采用等离子熔覆技术在45钢表面制备TiC/Ni合金粉末制备人体步进防滑涂层,分析了涂层步进摩擦系数、显微组织、摩擦磨损性能、涂层材料和表面形貌对涂层防滑性能的影响。结果表明:加入TiC不仅提高了涂层的耐磨性,还提高了涂层的步进摩擦系数。随着TiC含量的增加,涂层摩擦系数和耐磨性均增加,除此之外涂层表面三维形貌、涂层材料都会对步进摩擦产生影响,并且干态摩擦系数大于湿态摩擦系数;相对于等离子喷涂制备的涂层,等离子熔覆制备的涂层虽然步进摩擦系数略低,但耐磨性明显提高。 相似文献
5.
6.
针对钛基复合材料发展应用中的关键问题——高温氧化性能,通过800℃高温进行氧化实验得到了氧化增重特性,并利用扫描电镜SEM(Soanning Electron Microscope)、能谱仪EDS(Electronic Differential System)和X衍射XRD(X-ray Diffractometer)研究了钛基复合材料经氧化试验后表面氧化层的结构、相组成及成分。结果表明:钛基复合材料的氧化规律为抛物线规律,以Ti6Al为基的钛基复合材料比以纯钛为基的钛基复合材料具有更好的抗高温氧化性能,增强体含量越高,复合材料的抗氧化性越佳。TiC颗粒及其与基体的界面对复合材料的氧化物形成有重要的影响,Al原子的加入改变了材料的氧化机制。 相似文献
7.
《江苏科技大学学报(社会科学版)》2018,(6)
将镍包WC粉末与NiCrBSi粉末、粘结剂按一定比例混合后压制成WC涂层布I,用同样的方法制备了NiCrBSi钎料涂层布Π.采用真空熔覆法制备了WC-NiCrBSi复合涂层,通过改变WC-NiCrBSi涂层成分,研究涂层孔隙、耐磨性的变化规律.结果表明:随着WC质量分数的增加,孔隙增加,越靠近基体处孔隙越多.磨损量随着WC含量的增加先减少后增加. WC质量分数为30%、40%、50%、60%、70%、80%的复合涂层的磨损量分别为11. 2,10. 6,10. 1,10. 2,10. 5,10. 7 mg.磨损机制主要为脱层磨损、磨粒磨损和疲劳磨损. 相似文献
8.
9.
10.
11.
12.
《船舶与海洋工程学报》2016,(4)
Successful co-deposition of fine particulate matter within an Electroless Nickel-Phosphorous(ENi-P) matrix is dependent on various factors like bath composition, particle compatibility with metallic matrix, bath reactivity(pH), particle size and their distribution. ENi-P deposits incorporating Al_2O_3/Alumina in a disperse phase have varied effects on properties and attributes like surface roughness(Ra), microhardness, wear resistance, corrosion resistance and surface morphology of the deposits obtained. This paper experimentally investigates the effect of alumina(1.55 g/L) on Ra, microhardness, surface morphology, deposition rate, wettability, wear resistance and corrosion resistance of ENi-P-Al_2O_3 composite deposits on mild steel substrates at bath pH 5, 7 and 9. Study reveals that optimum deposit parameters and deposition rates are achieved with bath pH. However, not much study has been undertaken concerning composite deposits obtained from higher bath pH or basic bath. This is attributable to the fact that at higher bath pH or alkaline baths, the bath gets unstable and eventually degrades or decomposes, thereby resulting in sub optimal or poor deposition. Hence, experimental investigations carried out by preparing suitable baths, operating under optimum conditions, and enabling successful composite deposition in acidic and alkaline baths have revealed that there is a significant improvement in the above mentioned properties of the as-deposited composite deposits, as the pH is increased from pH 5 to pH 9. This aspect can therefore be advantageously utilized for preparing various marine components like fasteners, nuts, bolts, washers, pipes, cables, components having relative motion etc. 相似文献
13.
Successful co-deposition of fine particulate matter within an Electroless Nickel-Phosphorous (ENi-P) matrix is dependent on various factors like bath composition, particle compatibility with metallic matrix, bath reactivity (pH), particle size and their distribution. ENi-P deposits incorporating Al2O3/Alumina in a disperse phase have varied effects on properties and attributes like surface roughness (Ra), microhardness, wear resistance, corrosion resistance and surface morphology of the deposits obtained. This paper experimentally investigates the effect of alumina (1.55 g/L) on Ra, microhardness, surface morphology, deposition rate, wettability, wear resistance and corrosion resistance of ENi-P-Al2O3 composite deposits on mild steel substrates at bath pH 5, 7 and 9. Study reveals that optimum deposit parameters and deposition rates are achieved with bath pH. However, not much study has been undertaken concerning composite deposits obtained from higher bath pH or basic bath. This is attributable to the fact that at higher bath pH or alkaline baths, the bath gets unstable and eventually degrades or decomposes, thereby resulting in sub optimal or poor deposition. Hence, experimental investigations carried out by preparing suitable baths, operating under optimum conditions, and enabling successful composite deposition in acidic and alkaline baths have revealed that there is a significant improvement in the above mentioned properties of the as-deposited composite deposits, as the pH is increased from pH 5 to pH 9. This aspect can therefore be advantageously utilized for preparing various marine components like fasteners, nuts, bolts, washers, pipes, cables, components having relative motion etc. 相似文献
14.
15.
16.
17.
颗粒增强复基复合材料具有优异的机械性能和物理性能,是制造水中兵器零部件理想的材料。本文综合评述颗粒增强铝基复合材料的各种制备方法和有关性能,介绍颗粒增强铝基复合材料在一些领域的应用情况。 相似文献